Известия Академии наук Республики Таджикистан. Отделение физико-математических, химических, геологических и технических наук, №1, 2014 г. |
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Скачать | Rakhmonov Z.Kh. | 7-21 | Sums of primitive characters over prime numbers |
We obtain a new bound for sums of a primitive character Dirichlet modulo an integer at shifted primes , a over primes . Our bound is nontrivial starting with . This extends the range of the bound of J.B.Friedlander, K.Gong, I.E.Shparlinskii that is nontrivial for . |
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Ключевые слова: характер Дирихле; сдвинутые простые числа; короткая сумма характеров; тригонометрическая сумма; Dirichlet character; shifted primes; short sums; estimating sum. | |
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Скачать | Tukhliev K. | 22-32 | Upper bounds of the deviations of certain classes of functions from their partial sums of Fourier-Chebyshev in
space. II |
The exact estimates of the rate of convergence of the Fourier-Chebyshev on some classes of functions defined by a differential operator of the second order and characterized by generalized modulus of continuity of the th order in the space are given. The upper bounds of deviations given classes of functions from their partial sums of Fourier-Chebyshev in space are calculated. The exact values of the -widths of classes of functions defined by the averaged modulus of continuity th order are found. |
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Ключевые слова: оператор обобщенного сдвига; модуль непрерывности m-го порядка; верхние грани; ряд Фурье-Чебышева; дифференциальный оператор; generalized shift operator; modulus of continuity of m-order; upper bounds; Fourier-Chebyshev series; differentiation operator. | |
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Скачать | Mamadayozov N.M. | 33-42 | Jackson-Stechkin type inequality and the values of some widths of functional classes in
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Exact inequalities of Jackson-Stechkin type have been obtained for the average moduli of continuity of th order The exact values of any -widths were calculated for the function classes. |
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Ключевые слова: неравенство Джексона-Стечкина; наилучшие приближения; модуль непрерывности; n-поперечники; Jackson-Stechkin’s inequality; the best approximation; modulus of continuity; n-widths. | |
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Скачать | Kurbonov I., Ikbolov S.I. | 43-51 | Questions of quality research of nonlinear regional problems of electromagnetoelasticity with memory |
The article deals with investigating questions of resolvability and smoothness of the generalized solutions of regional problems of mechanics, connected with medium of memory. Theorems of existence and uniqueness of the decision are proved and the question of smoothness of the generalized solutions of the specified tasks is investigated. At the proof of the theorem property of the connected fields and property of operators and, Fayedo-Galerkin's method, a method of monotony of Gronwall-Bellman's generalized inequalities are used. A priori estimates are established. |
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Ключевые слова: обобщенные решения; связанные поля; память; гладкость; оператор; априорные оценки; generalized decisions; connected fields; memory; smoothness; operator; a priori estimates. | |
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Скачать | Babadzhanov P.B., Kokhirova G.I., Obrubov Yu.V. | 52-69 | Theoretical radiants and velocoties of the meteor showers associated the near Earth asteroids discovered during 2005-2008 |
In the data base "Near-Earth Objects Dynamic Site" the orbits of 1456 near Earth asteroids (NEAs) were listed on January 1 2009 that were discovered during 1.01.2005-1.01.2009. According to the Tisserand invariant being a dynamical criterion distinguishing the objects orbits on asteroidal and cometary types as well as requiring the fulfillment of Earth crossing condition it was established that 137 NEAs are moving on comet-like orbits. Investigation of the orbital evolution of these NEAs under the planetary perturbations shows that during one cycle of the argument of perihelion variation 115 asteroids are quadruple, 14-eightruple, and 8-double crossers of the Erath orbit. Consequently, if these NEAs are the nuclei of extinct comets in reality then, according to the theory of formation and evolution of meteoroid streams, each of them can be a parent body of the meteoroid stream producing two, four or eight meteor showers. The results of calculations of theoretical geocentric radiants, velocities, and maximum activity dates of 588 meteor showers, possible associated with 137 NEAs, are given in the paper. It is shown that out of 137 NEAs 110 objects have observable meteor showers and, hence, are the nuclei of extinct comets. Since the parent bodies are members of its meteoroid streams, then the theoretical radiants of meteor showers define the directions, velocities, and dates of possible impacts of these bodies with the Earth. |
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Ключевые слова: астероид; метеороидный рой; метеорный поток; угасшая комета; радиант; орбита; эволюция; asteroid; meteoroid stream; meteor shower; extinct comet; radiant; orbit; evolution. | |
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Скачать | Mulloev N.U., Narziev B.N., Karimov M.B., Usupova J., Rasulov S.A. | 70-75 | Replacement influence on IR-spectra 1,3-dioksolanes |
Spectroscopic characteristics of heterocyclic connections of derivatives dioksolanes are investigated. On parametres of analytical strips and their changes at a variation of electronic and geometrical structure of a molecule, the molecular structural and spectral analysis of the investigated connections is carried out. |
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Ключевые слова: 1,3-диоксолан; ИК-спектры; замещение; индукционный эффект; 1,3-dioksolan; IR-spectra; replacement; induction effect. | |
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Скачать | Aminjanov A.A., Degtev M.I., Yuminova A.A., Popova O.N. | 76-83 | Diantipyrilalkanes as effective reagents in the segregating systems containing benzoic acid and salycilic acid |
The ability of diantipyrilalkanes to form the segregating systems in the presence of benzoic or salicylic acid, hydrochloric acid and water was investigated. The optimal limits and volumes of delamination were determined. The distribution mechanism of organic acids and hydrochloric acid as well as gallium (III) ions and thallium (III) ions was found. According to the composition of the extracted complexes partition and extraction constants were calculated. The method of the separation of macro-quantities of thallium and gallium ions was suggested. |
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Ключевые слова: диантипирилалканы; экстракция; бензойная (салициловая) кислота; ионы Ga(III), Tl (III); константа распределения (экстракции); diantipyrilalkanes; extraction; benzoic (salycilic) acid; Ga(III), Tl (III) ions; partition (extraction) constant. | |
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Скачать | Mirsaidov U.M., Yatimov P.M., Mamatov E.D., Kobuliev Z.V., Kurbonbekov A. | 84-87 | Chlorination of danburite concentrate |
The results of chlorination of danburite concentrate are presented in this work. The optimal parameters of ores reprocessing are proposed. |
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Ключевые слова: концентрат данбурита; переработка; хлорирование; danburite concentrate; reprocessing; chlorination. | |
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Скачать | Pulatov E.Kh., Isobaev M.J., Mavlonov B.G., Fayzilov I.U. | 88-93 | Aminonitriles in the constructing of thiazolidines heterocycle |
By interaction of methyl ethyl ketone, α-hydroxy ketones and ethoxyether of α-hydroxy ketones with hydrocyanic acid and ammonia derived amino and ethoxyaminonitrile and cyclic aminoxytaneimine. The compounds were obtaine by reaction of received product with carbon disulfide to form iminothiazolidinthiones and aminoxythanethiazolidintiones. |
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Ключевые слова: метилэтилкетон; оксикетоны; этоксикетоны; аминонитрилы; этоксиаминонитрилы; аминооксетанимины; иминотиазолидинтионы; сероуглерод; аминооксетантиазолидинтионы; methylethylketone; oxyketones; ethoxyketones; aminonitriles; carbondisulfite; aminooxetanimines; iminothiazolidinthiones; anaminoxethanthiazolidine thiones. | |
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Скачать | Moohidinov F.A. | 94-99 | Geology-structures charakterization of tunnel "Chormagzak" |
In this paper are considered the disjunctives and some important tectonic structures of territory building of the tunnel «Chormagzak». |
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Ключевые слова: неотектоника; тектоника; туннель; структура; синклиналь; антиклиналь; надвиг; neotectonic; tectonic; tunnel; structures; synclinal; anticlinal. | |
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Скачать | Saidov M.C., Sarabekov N.Sh., Khudzhamulloev H.K., Salihov F. | 100-106 | The interpretation of observable changes of modern movements of the earth crust subsurface parts of Fayzabad geodynamic testing area |
The interpretation of modern movement of the Earth crust subsurface parts demonstrated on the example of Fayzabad geodynamic testing area which is provided in this paper. By means of high accuracy geodesic measurements, it is found out whether thrust fault phenomena common for this area and what quantity indicators as well as manner of deformation field parameters within heterochronous structures divided. |
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Ключевые слова: неотектоника; тектоника; реконструкция; полигон; геотектоника; интерпретация; надвиг; neotectonics; tectonics; reconstruction; testing area; geotectonic; interpretation; thrust. | |
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Скачать | Sabirov A.A. | 107-113 | Two new genera of primitive сalcareous paleozoic foraminifera |
In the article on the basis of analysis of the world literature and author’s research in the composition of Parathuramminidae family two new genera of primitive foraminifera have been established and described. |
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Ключевые слова: фораминиферы; паратурамминиды; систематика; палеозой; foraminifera; parathuramminides; taxonomy; Paleozoic. | |
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Скачать | Karimov Kh.S., Akhmedov Kh.M., Hussain Mujahid | 114-119 | Investigation of prperties of photovoltaic module (ARCO Solar-ASI-16-2300-20) experimentally and by modeling and simulattion |
In the paper it is presented the experimental results of investigation of properties of the PV module (ARCO Solar-ASI-16-2300-20) at natural conditions and by modeling and simulation. It is considered that series and parallel resistances that are in equivalent circuit of PV device depends on illumination and temperature. As a fitting parameter diode ideality constant was used. |
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Ключевые слова: естественные условия; фотоэлектрический модуль; моделирование; последовательное и параллельное сопротивления; эквивалентная схема; модуль; интенсивность света; вольтамперная характеристика; natural condition; photovoltaic module; simulation; serial and parallel resistance; equivalent circuit; light intensity; current voltage characteristic. | |
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Скачать | , | 120-126 | |
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Ключевые слова: . | |
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Скачать | , , , , , | 127-128 | |
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Ключевые слова: . | |
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